Sodium nitrate -- a difficult discontinuous phase transition

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TypeArticle
Journal titleCanadian Journal of Physics
Volume82
Pages10971107; # of pages: 11
AbstractCapacitance dilatometry was used to measure the relative thermal expansivity, DeltaL/L0, of single crystals of sodium nitrate (NaNO3) as a function of temperature. From these measurements, the phase transition at Tf = 550 K shows characteristics of a discontinuous transition. A theory based on the competition between long-range interactions and the entropy gained by rotating NO3– groups at high temperatures predicts a discontinuous transition at T = Tf with DeltaL/L0 sim (Tf – T)zeta with zeta = 1. Our measurements yield zeta asymp 1. PACS Nos.: 23.23.+x, 56.65.Dy Nous avons utilisé la dilatométrie capacitive pour mesurer le rapport d'expansion relative DeltaL / L0 de cristaux simples de nitrate de sodium (NaNO3) en fonction de la température. Ces mesures indiquent que la transition de phase à Tf = 550 K a les caractéristiques d'une transition discontinue. Une théorie basée sur la compétition entre les interactions à longue portée et le gain en entropie dans la rotation des groupes NO3– à haute température, prédit une transition discontinue à T = Tf avec DeltaL / L0 sim (Tf – T)zeta, où zeta = 1. Nos mesures indiquent zeta asymp 1.[Traduit par la rédaction]
Publication date
Linkhttp://www.ingentaconnect.com/content/nrc/cjp/2004/00000082/00000012/art00011
AffiliationNational Research Council Canada; NRC Canadian Neutron Beam Centre
Peer reviewedNo
NPARC number12328115
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Record identifierca832c56-5b69-462d-8cfd-0a2ffffb8d60
Record created2009-09-10
Record modified2016-05-09
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